What is described as a discontinuous signal that changes from one state to another in several distinct steps?

A digital signal is characterized by its discontinuous nature, meaning it has specific, distinct states rather than a smooth, continuous flow. This type of signal typically represents data in binary form, using discrete values—often just two states representing 0 and 1. The change from one state to another occurs in several distinct steps, which makes digital signals particularly suitable for modern communication systems, including computers and digital networks.

In contrast, an analog signal represents information in a continuous manner, varying smoothly over time. Current signals and EMI (Electromagnetic Interference) signals don't adequately fit the description of changing states in distinct steps as digital signals do, making digital signals the correct choice in this context.